xmr-stak on debian algo monero7

Did you adjust the algo from monero to monero7 ? In your config file ?
Only updating the miner doesn't fix the new algo, you need to change it to monero7.

"pool_list" :
[
   {"pool_address" : "168.235.86.33:3386", "wallet_address" : "SK_qSQgoe3NtQn8xmSxmtDW9.3LCn7xt7h7H2k9WDrELcAcxdMMk1zihTXz", "rig_id" : "", "pool_password" : "", "use_nicehash" : false, "use_tls" : false, "tls_fingerprint" : "", "pool_weight" : 1 },
],

"currency" : "monero7",

I kinda use the same config as provided for the windows machines.